Research Supporting Tropical Fruit Growers in the U.S. Pacific Basin

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1 Research Supporting Tropical Fruit Growers in the U.S. Pacific Basin Marisa Wall Center Director U.S. Pacific Basin Agricultural Research Center USDA-ARS, Hilo, HI

2 USDA-ARS-DKI-PBARC Scientific Excellence with Impact CORE STRENGTHS Pest and disease management, invasive species Tropical germplasm preservation, genetic resources Postharvest technologies, quarantine treatments, value-added products

3 Invasive pest species Biology, ecology, genetics Detection and mitigation Biological control Management & suppression

4 Invasive Fruit Flies Over 100 years in Hawaii Oriental fruit fly Melon fly Med fly Area-Wide Pest Management Detection & Chemical Ecology Biological Control Ecology and Behavior Genetics, SIT, Mass Rearing Solanaceous

5 Invasive Pests AW-IPM for Coffee Berry Borer Provide growers with real-time data on CBB populations and weather, plus recommend optimum control at diverse landscapes. Beauvaria bassiana Sanitation Strip picking Pruning Predators Parasitoids Nematodes 16 sites in Hawaii &Puerto Rico

6 Tropical Germplasm Preservation Preservation of 14 crops. Collection is ~1000 accessions maintained as living plants, in tissue culture and in greenhouses. Includes pineapple, papaya, lychee, rambutan, starfruit, breadfruit, guava, acerola cherry, macadamia and pili nut.

7 National Clonal Germplasm Repository Major Crops Ananas comosus (pineapple) Artocarpus altilis (breadfruit) Averrhoa carambola (starfruit) Bactris gasipaes (peach palm) Canarium ovatum (pili nut) Carica papaya (papaya) and relatives Dimocarpus longan (longan) Litchi chinensis (lychee) Macadamia integrifolia (macadamia) Malpighia glabra (acerola) Nephelium lappaceum (rambutan) and N. ramboutan-ake (pulasan) Passiflora edulis (passion fruit) Psidium guajava (guava)

8 Flowering of Tropical Crops

9 Breeding for Freckle free papaya in Hawaii Hawaii papayas with freckles Freckle Free papayas from Brazil freckle free grown in Hawaii as parent plant for crosses Goal: Combine great taste and PRSV resistance from Hawaii papayas with freckle free appearance

10 Diseases of Tropical Crops Longan Decline Symptoms: Leaf chlorosis, necrosis, leaf twisting, and leaf drop Potential fungal pathogens recovered from roots/soil (1) and fruit (2): (1) Phytopythium sp. (possibly vexans): has a wide host range including bananas, Citrus, papaya, ohia, avocado, many vegetables; is favored by excessive root moisture caused by poor drainage (2) Cylindrocladiella sp. (possibly lageniformis): This genus contains many species which cause root and stem rots (possibly as weak pathogens).

11 Postharvest Technologies Phytochemical & nutritional analyses Postharvest physiology, storage & handling Quarantine treatments

12 Noni juice: biochemical composition & anti-tumor activity Microbial changes Sugars, organic acids, ethanol Volatiles ( novel esters) Fractionated for potential antitumor compounds Fermented noni juice has anti-tumor activity through activation of both innate and active immune responses. Noni juice delivered orally to mice enabled tumor rejection, as well as eradication of existing tumors.

13 Postharvest Technologies Hypobaric storage Cold storage of fruit under partial vacuum Low O2 partial pressure Reduce ethylene & respiration rates Potential for high-quality fruit after months of storage. Double or triple shelf-life.

14 Postharvest Technologies Hypobaric storage Hypobaric (2.7 kpa) treated mangos after storage for 28 days at 13⁰C.

15 Hypobaric storage Cherimoya after 13 days Control (100kPa) Hypobaric (2.7kPa) Cherimoyas after hypobaric storage for 20 days (L), ripe fruit at day 23 (R)

16 Market Access: Quarantine Treatment Technology Heat Cold CA/MA Hypobarics Radiation (X-ray) Systems Approach

17 Market Access Quarantine treatments for Hawaii exports Abiu I Jackfruit I Atemoya I Longan I, H Avocado F, S (Sharwil) Lychee I, H Banana I, N Mango I Breadfruit I Mangosteen I Capsicum spp. I Moringa I Carambola I Papaya I, H Citrus I, H Pineapple I, N, H Cucurbita spp. I Rambutan I, H Dragon fruit I Sapodilla I Durian N Sweet potato I, F, H Eggplant I Tomato I Guava I Cowpea I I = irradiation, C = cold, N = non-host status, S = systems approach, H = heat (hot water immersion or vapor heat), F = fumigation.

18 MAHALO CONTACT: Marisa Wall (808) Center Director U.S. Pacific Basin Agricultural Research Center 64 Nowelo Street, Hilo, HI

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